Water Engine

WSM Top End Kit - +0.50 mm - Polaris 54-311-12

Regular price $5,957⁰⁰ TWD

Low stock (4 units)
WSM Top End Kit - +0.25 mm - Yamaha 54-536-11

Regular price $3,178⁰⁰ TWD

Low stock (4 units)
WSM Top End Kit - +0.50 mm - Yamaha 54-536-12

Regular price $3,178⁰⁰ TWD

Low stock (2 units)
WSM Top End Kit - Standard - Yamaha 54-536-10

Regular price $3,178⁰⁰ TWD

Low stock (3 units)
Sold out

WSM Top End Kit - .75mm - Yamaha 54-536-13

Regular price $3,116⁰⁰ TWD
WSM Top End Kit - 1mm - Yamaha 54-536-14

Regular price $3,178⁰⁰ TWD

Very low stock (1 unit)
WSM Top End Kit - Standard - Yamaha 54-540-10

Regular price $4,538⁰⁰ TWD

In stock (6 units)
Sold out

WSM Top End Kit - .25mm - Yamaha 54-540-11

Regular price $4,538⁰⁰ TWD
WSM Top End Kit - .5mm - Yamaha 54-540-12

Regular price $4,538⁰⁰ TWD

Low stock (3 units)
WSM Top End Kit - .75mm - Yamaha 54-540-13

Regular price $4,538⁰⁰ TWD

In stock (11 units)
WSM Top End Kit - 1mm - Yamaha 54-540-14

Regular price $4,538⁰⁰ TWD

Very low stock (1 unit)
Sold out

WSM Top End Kit - .25mm - Yamaha 54-544-11

Regular price $6,119⁰⁰ TWD
WSM Top End Kit - .5mm - Yamaha 54-544-12

Regular price $6,241⁰⁰ TWD

Low stock (3 units)
Sold out

WSM Top End Kit - .75mm - Yamaha 54-544-13

Regular price $6,119⁰⁰ TWD
WSM Top End Kit - Standard - Yamaha 54-544-10

Regular price $6,241⁰⁰ TWD

Very low stock (1 unit)
WSM Top End Kit - 1mm - Yamaha 54-544-14

Regular price $6,241⁰⁰ TWD

Very low stock (1 unit)
WSM Top End Kit - Standard - Yamaha 54-546-10

Regular price $6,809⁰⁰ TWD

Very low stock (1 unit)
WSM Top End Kit - .5mm - Yamaha 54-546-12

Regular price $6,675⁰⁰ TWD

Low stock (2 units)
WSM Top End Kit - .25mm - Yamaha 54-546-11

Regular price $6,675⁰⁰ TWD

Low stock (3 units)
Sold out

WSM Top End Kit - 1mm - Yamaha 54-546-14

Regular price $6,675⁰⁰ TWD
WSM Top End Kit - .25mm - Yamaha 54-546-21

Regular price $6,675⁰⁰ TWD

Low stock (3 units)
WSM Top End Kit - .5mm - Yamaha 54-546-22

Regular price $6,675⁰⁰ TWD

Low stock (2 units)
WSM Top End Kit - Standard - Yamaha 54-546-20

Regular price $6,809⁰⁰ TWD

In stock (5 units)
Sold out

WSM Top End Kit - .75mm - Yamaha 54-546-13

Regular price $6,675⁰⁰ TWD
Sold out

WSM Top End Kit - .75mm - Yamaha 54-546-23

Regular price $6,675⁰⁰ TWD
Sold out

WSM Top End Kit - .25mm - Suzuki/Kawasaki 400 54-254-11

Regular price $6,798⁰⁰ TWD
WSM Top End Kit - 1mm - Yamaha 54-546-24

Regular price $6,675⁰⁰ TWD

Low stock (2 units)
WSM Top End Kit - Arctic Cat - Standard 54-254-10

Regular price $6,934⁰⁰ TWD

Very low stock (1 unit)
WSM Top End Kit - .75mm - Suzuki/Kawasaki 400 54-254-13

Regular price $6,798⁰⁰ TWD

Low stock (4 units)
WSM Top End Kit - 1mm - Suzuki/Kawasaki 400 54-254-14

Regular price $6,798⁰⁰ TWD

Low stock (3 units)
WSM Top End Kit - .5mm - Suzuki/Kawasaki 400 54-254-12

Regular price $6,798⁰⁰ TWD

Low stock (3 units)
WSM Top End Kit - Standard - Honda 200 54-222-10

Regular price $2,823⁰⁰ TWD

In stock (6 units)
WSM Top End Kit - .5mm - Honda 200 54-222-12

Regular price $2,823⁰⁰ TWD

Very low stock (1 unit)
Sold out

WSM Top End Kit - 1mm - Honda 200 54-222-14

Regular price $2,823⁰⁰ TWD
WSM Top End Kit - .25mm - Honda 200 54-222-11

Regular price $2,823⁰⁰ TWD

Very low stock (1 unit)
WSM Top End Kit - Standard - Honda 300 54-219-10

Regular price $4,110⁰⁰ TWD

Very low stock (1 unit)
Sold out

WSM Top End Kit - .5mm - Honda 300 54-219-12

Regular price $4,294⁰⁰ TWD
Sold out

WSM Top End Kit - Standard - Honda 420 54-231-20

Regular price $5,787⁰⁰ TWD
WSM Top End Kit - .25mm - Honda 420 54-231-21

Regular price $5,787⁰⁰ TWD

In stock (5 units)
Sold out

WSM Top End Kit - 1mm - Honda 300 54-219-14

Regular price $4,210⁰⁰ TWD
WSM Top End Kit - .75mm - Honda 420 54-231-23

Regular price $5,787⁰⁰ TWD

Low stock (3 units)
WSM Top End Kit - .5mm - Honda 420 54-231-22

Regular price $5,787⁰⁰ TWD

Very low stock (1 unit)
$1,893.00 off

WSM Top End Kit - Standard - Polaris 800 54-315-10

Sale price $9,240⁰⁰ TWD Regular price $11,133⁰⁰

Low stock (2 units)
$949.00 off

WSM Top End Kit - Standard - Polaris 54-320-10

Sale price $11,328⁰⁰ TWD Regular price $12,277⁰⁰

Very low stock (1 unit)
WSM Top End Kit - 1mm - Honda 420 54-231-24

Regular price $5,787⁰⁰ TWD

Very low stock (1 unit)
Sold out

WSM Top End Rebuild Kit 010-862-10

Regular price $23,016⁰⁰ TWD
WSM Top End Rebuild Kit 010-862-12

Regular price $23,477⁰⁰ TWD

Low stock (2 units)
Sold out
$535.00 off

WSM Piston Assembly 50-520-64

Sale price $4,709⁰⁰ TWD Regular price $5,244⁰⁰
WSM Top End Rebuild Kit 010-862-14

Regular price $23,477⁰⁰ TWD

In stock (5 units)
Sold out
$535.00 off

WSM Piston Assembly 50-520-645

Sale price $4,709⁰⁰ TWD Regular price $5,244⁰⁰

Let customers speak for us

from 672 reviews

Will Be Back!

I recently purchased the Arrow Race-Tech Slip-On Exhaust (Aluminum Dark) for my Kawasaki Z900 (’17–’24), and I couldn’t be happier. The quality is top-tier—lightweight, beautifully finished, and it gives the bike the deep, aggressive sound it should’ve had from the factory. Throttle response feels smoother, and the overall riding experience is noticeably more exciting.

Huge shoutout to Bill from Bills Exhaust. His communication was excellent from start to finish—quick replies, honest info, and genuinely great customer service. The exhaust shipped fast with no delays, no issues, and no backorder nonsense. Exactly what you want when ordering parts for your bike.

If you’re on the fence, go for it. The exhaust is incredible, and Bill makes the whole process even better. Highly recommend!

Brian Brayley

12/01/2025

71856AKN Arrow Race-Tech Slip-on Exhaust, Aluminum Dark for Kawasaki Z900 17-24

Arrived super quick

Arrived super quick, no complaints

Anonymous

11/20/2025

IN STOCK M4 Exhaust GP Black Slip on GSXR600/750 2011-2025 SU6112-GP

Great customer support

Great customer support, fast shipping and delivery , and great quality exhaust . Sounds nice 👍🏼 would definitely recommend

Atticus

11/13/2025

IN STOCK M4 Exhaust GP19 Black Slip On 2009 - 2025 2026 ZX6R zx6 KA6922-GP19

Fast service and the pipe is very well made

Fast service and the pipe is very well made.

72188PD Arrow H.D.1250 Pan America 20-25 Racing St. Steel De-Catalyzed Collector

Purchased the power core 4 along with the mega bomb header

Purchased the power core 4 along with the mega bomb header. Sounds great! Looks even better! Slammed them both on my 22’ KX 250f.

ROBERT T CLARK

11/11/2025

FMF Powercore 4 Muffler KX250F/X 2021-2023 042392 1821-2038

Was trying to find a reseller for Graves products. Stumbled upon this site. No hassles. Ships to Australia (big plus). Now I can mod my dream bike.
Exhaust is gnarly, obnoxious... exactly what I want! Makes all the right sounds.
I'd buy another one if I had another bike.
Super easy fitment, shaved off so much weight with the titanium build.
Absolute piece of art.

Nazzy

11/05/2025

Bill's Exhausts

Great price and amazing sound

Great price and amazing sound.

Michael Adams

10/27/2025

AKRAPOVIC Carbon Fiber Muffler NINJA 400 /500 2018-2025 S-K4SO6-APC 1811-3515

This system with a BT Moto tune sounds and feels amazing

This system with a BT Moto tune sounds and feels amazing. The weight reduction, power increase makes this bike handle even better.
The titanium exhaust system looks amazing.

Lou D

10/19/2025